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Date: Fri, 20 Apr 2018 08:05:17 -0700 From: Kees Cook <keescook@...omium.org> To: Pavel Machek <pavel@....cz> Cc: Daniel Micay <danielmicay@...il.com>, Tony Lindgren <tony@...mide.com>, Thorsten Leemhuis <regressions@...mhuis.info>, Linus Torvalds <torvalds@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>, Stephen Rothwell <sfr@...b.auug.org.au>, Linux-Next Mailing List <linux-next@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, pali.rohar@...il.com, sre@...nel.org, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, linux-omap@...r.kernel.org, Kevin Hilman <khilman@...nel.org>, Aaro Koskinen <aaro.koskinen@....fi>, ivo.g.dimitrov.75@...il.com, Patrik Bachan <patrikbachan@...il.com>, "Serge E. Hallyn" <serge@...lyn.com>, Mickuláš Qwertz <abcloriens@...il.com>, Clayton Craft <clayton@...ftyguy.net>, Martijn Braam <martijn@...xit.nl>, Sakari Ailus <sakari.ailus@...ux.intel.com>, Filip Matijević <filip.matijevic.pz@...il.com>, Jinbum Park <jinb.park7@...il.com>, Russell King <rmk+kernel@...linux.org.uk> Subject: Re: [regression v4.17-rc0] Re: FORTIFY_SOURCE breaks ARM compilation in -next -- was Re: ARM compile failure in Re: linux-next: Tree for Apr 4 On Fri, Apr 20, 2018 at 12:34 AM, Pavel Machek <pavel@....cz> wrote: > On Sun 2018-04-15 11:00:06, Kees Cook wrote: >> On Sun, Apr 15, 2018 at 10:39 AM, Pavel Machek <pavel@....cz> wrote: >> > Hi! >> > >> >> Thanks. >> >> >> >> Ok, let me try to bisect it. Compile-problem should be easy... >> >> >> >> Hmm. And as it is compile-problem in single file, it should even be >> >> reasonably fast. I did not realize how easy it would be: >> >> >> >> #!/bin/bash >> >> set -e >> >> cp config.ok .config >> >> yes '' | ARCH=arm make lib/string.o >> >> >> >> And the winner is: >> >> >> >> ee333554fed55555a986a90bb097ac7f9d6f05bf is the first bad commit >> >> commit ee333554fed55555a986a90bb097ac7f9d6f05bf >> >> Author: Jinbum Park <jinb.park7@...il.com> >> >> Date: Tue Mar 6 01:39:24 2018 +0100 >> > ... >> > >> >> Acked-by: Kees Cook <keescook@...omium.org> >> >> Signed-off-by: Jinbum Park <jinb.park7@...il.com> >> >> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk> >> > >> > So I bisect a problem in -next, and patch is merged to Linus, >> > _anyway_, breaking compilation there? Neither Jinbum nor Russell even >> > bother to comment. >> >> Hi! Sorry I lost this email in my inbox. It seems this is specific to >> a particular subset of arm architectures? (My local builds of arm all >> succeed, for example. Can you send your failing config?) I'll take a >> closer look on Monday if Daniel doesn't beat me to it. > > Daniel, Kees: any news? > > I'm aware you did not specify which Monday :-). Hi! Sorry, I got distracted. So the .config you sent me builds fine with my cross compiler. I suspect this is something specific to ELDK's compiler. I can try some other compiler versions. What version of gcc is failing? -Kees -- Kees Cook Pixel Security
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